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Background & Objective: Bombesin (BBS) is a tetra-decapeptide amino acid neuropeptide in central nervous system within a variety of mammalian species. Also it has many biological effects that may be effective in modulation of anxiety. The aim of present study was to determine the effect of BBS on modulation anxiety reaction in elevated plus maze (EPM) in mice.

 

Materials & Methods: 60 male mice (25-30 g) were used in this study. Bombesin in doses of 1.25, 2.5, 5, 10 and 20 µg/kg IP or saline was injected in different groups 10 min before of evaluation. Five minutes later for increase of activity, animal was put in black box for 5 min. Then each animal in regulated time transferred to standard elevated plus-maze and the time spent in the open arms and the ratio of open arm entries during 5 min, were measured. The data analyzed by using ANOVA and Tukey test.

 

Results: BBS in dose dependently manner increase which the anxiety reaction in mice. Animals had spent lower time and ratio of open arm entries in compare with control group significantly (P<0.05) and BBS only in dose of 1.25 µg/kg did not showed significantly effect.

 

Conclusion: This study indicated that Bombesin in dose dependently manner have important role in modulate anxiety reaction in EPM in mice.

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Background & Objective: Many evidence indicated that action of glucocorticoid receptors can modulate anxiety behaviors and these effects probably mediated by nitric oxide (NO) system. Thus, in this study, we investigated interaction between corticosterone and NO on anxiety behaviors in mice in elevated plus maze (EPM).

Materials & Methods: In this experimental study male albino mice (25-30 g) were used. A standard EPM was used to determine anxiety behaviors. Two behavioral measures were used that include of the percentage of time spent in the open arms and the ratio of open arm entries to total entries during 5 min. Animals received IP injection of L-Name 30 mg/kg as an inhibitor or L-Arginine 50 mg/kg as a synthesis of NO or saline 60 min and corticosterone (1, 2.5, 5 mg/kg) 30 min before of evaluation.

Results: Analysis of data indicated that corticosterone at doses of 1 and 2.5, but not 5 mg/kg significantly reduced anxiety behavior in mice (P<0.05). Also pretreatment of L-Name potentiate but injection of L-Arginine had inhibition of corticosterone effects (P<0.05).

Conclusion: This study revealed that glucocorticoid induces anxiolytic effects and these effects probably potentiate by NO inhibitor and reduced by NO synthesis. Therefore, it seems that there are interaction between of glucocorticoid and NO system for control of anxiety behaviors.

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Background and Objective: Several investigations have indicated the antinociceptive, anti-inflammatory, antipyretic effects and smooth muscle relaxant activity of Cassia species. This study was done to determine the effect of Cassia fistula on sleeping time and the level of anxiety in mice. Materials and Methods: In this experimental study, 80 male albino mice (25-30 g) randomly allocated in 8 groups. For measuring the sleeping time we used the Angle method and animals were divided into three experimentals (250, 500 and 1000 mg/kg) and one control group. For evaluating of anxiety levels, animals randomly were divided into three experimentals and one control group, and elevated plus maze (EPM) model was used. The evaluation of anxiety indices included number and percent of time spent in open arm. Different doses of the aqueous extract of Cassia fistula (250, 500, 1000 mg/kg IP) were injected intraperitoneally to the treated groups. Controls were recived 10 ml/kg/BW normal saline intraperitoneally in both methods. Results: The extract of Cassia fistula (250, 500 and 1000 mg/kg) significantly increased sleeping time [F (3, 39)=23.19, P<0.05]. Also open time [F (3,39)=15.55, P<0.05] and the number of open arm entries [F (3, 39)=24.21, P<0.05] were significantly in doses (250mg and 500 mg) were singnificantly more than control group, respectively (P<0.05). Conclusion: This study showed that the aqueous extract of Cassia fistula fruit incerase the sleeping time and deereasing level of anxity in mice.